If I focus on an item in Explorer & <CTRL><ENTER> Item opens in new tab.
If I switch focus to another Explorer item & repeat I get the first focused item in a new tab, etc.
If I focus on a favorites icon & use the same set of keys, MS Word opens
Using keys <ALT><CTRL>A-Z or 0-9 do nothing.
I ran compact/repair w no change in the above behavior.